Blood Testing for Allergies
Allergy Blood Test Results
A positive result means allergy-specific antibodies were detected in your blood. This is usually a sign of an allergy.
The blood test will reveal what exactly you are allergic to. However, you can test positive for something but never have had an allergic reaction to it.
A negative result means you probably do not have a true allergy. That means your immune system probably does not respond to the allergen tested. However, it is possible to have a normal (negative) allergy blood test result and still have an allergy.
Allergy blood test results should be interpreted with caution by an allergy specialist. Your doctor will also consider your symptoms and medical history when diagnosing a specific allergy.
Side Effects of Allergy Blood Tests
Allergy blood testing is relatively safe. Side effects are usually minor and may include:
- Swelling and redness at the site where the needle was inserted
- Bleeding at the site where the needle was inserted
- Some people may faint during blood testing.